AOG: What Every Aircraft Owner Should Do When Their Plane Needs a Part Right Now

Your aircraft is grounded. The A&P mechanic just called: the part you need to fly this weekend is on backorder from the national catalog, and the earliest ETA is Thursday. It's Monday.

Welcome to AOG: the acronym that stops a general aviation owner's week cold, drains the checking account faster than an unexpected annual inspection, and reveals, in about 90 seconds, whether the aviation supply chain around you is prepared to keep you flying.

This guide is the response plan every South Florida general aviation owner, A&P mechanic, and flight-school director of maintenance should have on hand, long before the AOG event happens. It walks through what AOG really costs, the 6-step response plan that gets your aircraft back in the air fastest, the most common mistakes owners make when panic sets in, and why the answer to an AOG aircraft parts situation almost never lives inside a national mail-order catalog.

What AOG Actually Means

AOG stands for "Aircraft On Ground." In commercial and military aviation, it's a technical term with formal escalation procedures, the moment an aircraft cannot legally or safely fly, everyone from the parts vendor to the FAA gets a phone call. In general aviation, it's less formal but often more painful, because there's no airline dispatcher and no fleet backup: the aircraft is yours, the trip is yours, and the problem is yours to solve.

An AOG event happens when any of the following stops the aircraft from being airworthy:

• A required part fails or is found to be worn beyond limits at annual/100-hour inspection.

• Damage — bird strike, prop strike, hangar rash, ramp incident.

• A required document (like an 8130-3) is missing from an installed part.

• An expired airworthiness item (transponder check, ELT battery, IFR certification).

• A supply-chain problem — the part exists, it just isn't where you are.

What AOG Really Costs — The Hidden Math

Owners usually think about AOG in terms of the missing part's price. That's the smallest number in the equation. The real cost of an aircraft grounded even for a few days:

• Hangar fees continue to accrue. Your monthly hangar rent doesn't stop.

• Insurance premium doesn't pro-rate for downtime.

• Missed trips have real value — canceled family weekends, missed business flights, forfeited flight-training bookings for schools.

• Rescheduling costs — if you had customers waiting on Part 91 charter or a flight-school revenue slot, you're refunding or comping.

• A&P labor idles — a mechanic waiting on a $32 filter can't complete the $2,800 annual invoice. Everyone loses.

• Rebooking business trips at last-minute airline fares — often 3–5× the cost of the original flight.

A single day of AOG on a training Cessna 172 easily represents $600–$1,200 in lost revenue and continued fixed costs. On a personal aircraft used for business travel, a two-day AOG event during a booked trip can exceed $2,000 in real out-of-pocket cost.

Every hour the aircraft is grounded, you're paying somebody. The math on paying a small premium for a locally stocked part almost always favors local, even before you count the value of your own time.

The 6-Step AOG Response Plan

When you get the phone call from your A&P — the part is needed and it isn't in stock — follow this playbook. It's designed to get your aircraft flying in the shortest possible time, at the lowest total cost.

Step 1 — Call Your Local Aviation Parts Supplier FIRST

Not Aircraft Spruce. Not Chief. Not Airparts. Call the parts counter at your home airport, or the closest airport with a stocked GA parts counter. Local aviation suppliers exist precisely for AOG situations, and they solve them faster than any national catalog can.

Frassi AeroParts at North Perry Airport (KHWO) stocks the top-100 GA consumables, filters, spark plugs, brake linings, tires, and hardware — with a 60-minute AOG response guarantee for any aircraft based at KHWO, FXE, OPF, TMB, or BCT. That's the standard South Florida GA owners should measure any parts supplier against.

Step 2 — Have the Part Number Ready

The single fastest way to slow down an AOG call is uncertainty about the part number. Before you dial, pull the following:

• The specific part number (Champion CH48110-1, Tempest AA48110-2, Cleveland 066-10500 — not "the oil filter for my Cessna").

• Your aircraft make, model, and year.

• Your engine model (Lycoming O-360-A4M, Continental IO-520-BB, etc.).

• The number of units needed.

• Whether 8130-3 traceability is required (for an installable part on a certificated aircraft, the answer is virtually always yes).

If your A&P is on the phone with you, ask them to relay the exact number from the parts catalog or service bulletin — do not guess.

Step 3 — Ask the Right Questions

Any competent parts supplier can answer the following in 90 seconds. If they cannot, move on:

• Do you have it in stock, at your counter, right now? ("We can order it" is not the same answer.)

• What's the price? Publish-and-post pricing is a sign of an honest counter.

• Do you provide 8130-3 traceability with it? No exceptions for installable parts.

• How soon can I pick it up or have it delivered? For AOG-based aircraft, "same day" or "within an hour" should be the standard answer.

• What's the payment method? Card, ACH, or on-account for established customers.

Step 4 — Verify the Part Matches Your Aircraft

Before you commit, ask the supplier to confirm the part is FAA-PMA approved for your specific engine or airframe. A reputable supplier will pull the approval list and confirm on the phone. This is not optional — the wrong part on a certificated aircraft creates liability for everyone involved.

Step 5 — Arrange Pickup or Delivery

For AOG-based aircraft at your home field, the fastest path is a physical pickup: the supplier stages the part at the counter, you or your A&P drives across the ramp, signs, and leaves in less than 30 minutes. If you're at an off-field airport within delivery range, request same-day delivery — most local aviation suppliers run a delivery vehicle for exactly this purpose.

Frassi AeroParts delivers same-day to KHWO tenants and coordinates same-day or overnight service to FXE, OPF, TMB, and BCT for AOG events.

Step 6 — Verify Documentation Before Installation

When the part arrives, before your A&P installs it, confirm:

• 8130-3 tag or Certificate of Conformity is present.

• The part number on the paperwork matches the physical part.

• The tag's date, condition (new/overhauled), and serial number (if applicable) are correct.

If any documentation is missing or wrong, stop, call the supplier, and get it fixed before installation. Installing a part without proper traceability creates a maintenance record issue that can affect resale value and airworthiness certification.

Common AOG Mistakes to Avoid

Panic drives decisions that cost owners more than the AOG itself. The most common:

• Ordering from the first result on Google without confirming stock. National catalogs show a part as "in stock" when it's in a distribution warehouse three states away — a "yes" that translates to "three days from now." Always ask "in stock at your counter right now?"

• Skipping the 8130-3 to save time. An installed part without traceability is a compliance problem forever. Insist on paperwork, always.

• Paying for overnight shipping when a local supplier could deliver in an hour. Overnight FedEx to South Florida is $40–$85. A local supplier's delivery is typically $0 within 15 miles.

• Not building a relationship with a local supplier BEFORE the AOG. The best AOG response is the one you set up on a quiet Tuesday, months before you need it.

• Ordering the wrong part number. Verify twice, buy once. A returned wrong-part shipment adds days to an AOG event.

Why Local Beats Mail-Order for AOG — Every Time

The math is straightforward:

At current 2026 hangar rates, insurance costs, and lost-revenue calculations, the true cost of a 3-day mail-order AOG easily exceeds $500 in overhead alone — before the part price is added. A local supplier costs a few dollars more per unit but eliminates the multi-day wait entirely.

Preparing BEFORE Your Next AOG — The 10-Minute Task

The best time to set up your AOG plan is right now, before you need it. Do these five things this week:

1. Program the number of a local aviation parts supplier into your phone as a favorite.

2. Set up a customer account with them — even a Net-10 open account for $500 is enough to skip payment friction during an AOG call.

3. Verify your engine model and the part numbers for the most commonly failed consumables on your aircraft. Save them in a note on your phone or aircraft logbook cover page.

4. Confirm your A&P mechanic has a working phone-of-record for the local supplier. Many A&Ps already have these relationships; some newer mechanics don't.

5. Ask about the supplier's AOG service level — response time, delivery radius, after-hours availability, and whether they'll open the counter on a Saturday if needed.

Frassi AeroParts publishes a KHWO AOG contact number and offers a 60-minute response guarantee for our neighbors at North Perry Airport and the surrounding South Florida general aviation community.

Frequently Asked Questions

What does AOG mean in aviation?

AOG stands for Aircraft On Ground — the term used when an aircraft cannot fly because of a mechanical, documentation, or airworthiness issue. In general aviation, it's the moment your parts supply chain either saves your week or ruins it.

How much does an AOG event cost a GA owner?

Direct costs typically start at $600–$1,200 per day for a training aircraft and can easily exceed $2,000 per day for owner-flown personal aircraft used for business travel. Costs include hangar fees, insurance, missed trip value, lost revenue, and rebooking premiums. The missing part price is usually the smallest number in the equation.

Should I always call a local aviation parts supplier before ordering online?

Yes. For AOG situations, local suppliers are almost always faster and often cheaper on total landed cost (part + shipping + labor idle time). Even if the sticker price is a few dollars higher, the elimination of shipping wait usually makes local the correct choice for an urgent need.

What's the fastest way to get an aircraft part in South Florida?

Call Frassi AeroParts at North Perry Airport (KHWO). If the part is in stock, we stage it at the counter within 15 minutes and can arrange same-day delivery to KHWO tenants or coordinate service to FXE, OPF, TMB, and BCT for AOG events.

Do I need 8130-3 traceability for every aircraft part?

For any part installed on a certificated aircraft, yes. Ask for 8130-3 or a Certificate of Conformity with every purchase. Any supplier who hesitates or "will send it later" is a problem — walk away.

Have an AOG Right Now?

Call Frassi AeroParts. We stock the top-100 GA consumables at North Perry Airport (KHWO), Hangar 14, Pembroke Pines, FL — with same-day counter pickup, delivery to KHWO tenants, and 60-minute AOG response for aircraft based at KHWO, FXE, OPF, TMB, and BCT.

Before the next AOG event, save our number, set up your account, and read our guides on the parts that most often ground GA aircraft: Aircraft Oil Filters, Aircraft Spark Plugs, and Aircraft Engine Oil.

This article is provided for educational purposes. In an actual AOG event, always consult your A&P mechanic and follow current FAA guidance. Frassi AeroParts is not responsible for decisions made in response to this content.